Additive manufactured (AM) parts are produced at low volume or with complex geometries. Identifying internal defects is difficult as current testing techniques are not optimized for AM processes. The goal of this paper is to evaluate defects on multiple parts printed on the same build plate. The technique used was resonant frequency testing with the results verified through Finite Element Analysis. From these tests, it was found that the natural frequencies needed to detect the defects were higher than the excitation provided by a modal hammer. The deficiencies in this range led to the development of other excitation methods. Based on these results, traditional methods of resonant part inspection are not sufficient, but special methods can be developed for specific cases.
A. Allen and K. Johnson and J. R. Blough and A. Barnard and T. Hartwig and B. Brown and D. Soine and T. Cullom and D. A. Bristow and R. G. Landers and E. C. Kinzel, "Frequency Inspection of Additively Manufactured Parts for Layer Defect Identification," Proceedings of the 30th Annual International Solid Freeform Fabrication Symposium (2019, Austin, TX), pp. 1400 - 1410, University of Texas at Austin, Aug 2019.
30th Annual International Solid Freeform Fabrication Symposium -- An Additive Manufacturing Conference, SFF 2019 (2019: Aug. 12-14, Austin, TX)
Mechanical and Aerospace Engineering
Article - Conference proceedings
14 Aug 2019